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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b136d897d930fa0b7e0c6ef75507ded4c32987e098a58d295f5dde321c93ac8' 
  AND token = '0TV1QOQ0u3CqRUpwPcQaFnal0Yy1T6RDi4TE8jM63iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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