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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984d5b6aaab21146f1706c60f5dc5f96078511e6e21356613463e9ad2113f07a' 
  AND token = '/nszFB1ZAd5uzBai8na1+pqZ/2JTd7qpMAnEUG4qkNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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