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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e594deca53c350ddf3e71177cfd2b2068760bfa7225017523542e14f4757674' 
  AND token = 'DZO6K9opQ0EtMFpk12dRdWb9RkL2CRVhH09L+4rBCrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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