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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c50a27c78845bc1f132d829dd4346d73dfe904a56dd776763f58a29bcc8043' 
  AND token = 'Y3LKQ9qLllyXfSGUq37BB3bI9HBPwR6ungWbEr+td54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}