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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab51179b96056fe6c197067bd557b1aa01a6f0f86b2b51db4e0abbf8bd30e20' 
  AND token = 'l02jrhPrCSOGDaM4rmrp2rr0zw4LbaMXjNHhXPxzj8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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