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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5b3d7978ac1761bc71c862f29aa42d305849544f99aecf85a105634f546e6d' 
  AND token = '4dmbSvXXT5q0ur3Mw13r/tkdLkLO0NgtY3ecWNToaFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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