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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b04f55d3cefe0373522bfe70e8e824fc13619ecb15c078ff7c32c7ae0d0aea4' 
  AND token = 'V1tuVRjS+QuQx0fZELQxPKuHxMsG9ypNKQYrJWKAS1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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