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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350f4278f76884b6665e9e3796072baba5eac1f6f5d55909ede81a5264a3d57c' 
  AND token = 'SsPYhKGxEgV7+haMFtm7PLByDRdTWhDPxiLu1rD76Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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