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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e41d8c9401cdc320c4a82a0ea7842af7cacea0cc1183e61d7d5cdd03077921d' 
  AND token = 'ajA66k7Y4sEwUwDI2asvctbNfS6xs8hVYRQ6dytvr4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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