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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb05cee2dc1fa009442ebd624757d55d054afc552ab19c6c79ef253171a357e' 
  AND token = '1+T8qpkgMw8AW062x2UMhHWpOK2xo/qi0Vr3vtEEzm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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