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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe65a7930a4cecad6fb92a076ad282c5cda20d8aab52e3132c7a43772ae4c22' 
  AND token = '9iY5BbWhBqbTgaHpolaW4gkp91hK34dJCVAzvx48jc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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