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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7af66a25034b029dc72d20129b1d35bc6f3ef14f38e9b110f0c3a36d91a6852' 
  AND token = 'r3j5bO2n7uETRNnJwbo8xQ7hvNdiJmEwT1msqG0MgC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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