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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937e2c86fe528fcd6ad9b3580573cf7114aea337eb08117aa61988751b5e070a' 
  AND token = 'Jr6RQfgGubXJnpXTnuIAez3o2aKai0HIiKI/OUw0Foo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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