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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbe7c490223e04e745d1cb1091d7a1498cbb6b6bbf2dc11341443fb0da4002e' 
  AND token = 'F05jilu8Zppe9lZRV8y2Ug08s6KSSRrsTAZvtqwwQUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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