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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fe4c54d83b0cfccfda800c59f5781e9f00f57c5c28380bc3d4fae5f9cf2ca2' 
  AND token = 'dNT8BmY4hzzlGKfOcESa3nvCaJWzLt/bcWX6fZiAtvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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