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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0bfeebd3f8d9cc1121473fe17bb7498c5d4d79815c4ca865b6cef534cc0cff' 
  AND token = 'LN2VUSK66muep36xlzQRnTWMQN6qWPHGLnBn+EU2ZF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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