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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e02b2f665d8740683f76632fca8024e9cf94c42b45a9af9ede10e2f326a3fbb' 
  AND token = 'pAQkrb1eOROYNiKBgIBSaXe0sSbbnc1rvmgQFqsf9Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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