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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86161b5e14e9c5f4b05eab7b4d985a6bf2fdf48b14ccb4186a8ae57fe192f7f' 
  AND token = 'tE3UeV3e206P5MnJ8XHK4uq8OY9pzVFGNV7SXbvcP48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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