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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e0a891eb96e3f910c7413ecc9d5f719ce3e826feb6bf47f8d73b42ea2219d6' 
  AND token = 'OFNbgcx7nXgkEuLLOIHpo5CKag4wO3yxoxT0e+i+WhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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