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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5ae3d56d9b5f10aa95ee4bb3c807ba5a649bde81bc4655d41903700f91eb85' 
  AND token = 'HdFeD+04Gx+KhZNKUamK3ui5XX9dNioad84PBHqfhN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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