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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5660e573a40fe908663970f087feea9e575ccd95a55d3e9fda3df892311ffecf' 
  AND token = 'PkSKIs9qR6CgMN+y4uc20LlQZ2efV6QioVWrvEVFIv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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