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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0259d163a79d466a51e5e1a963a9e9db16db611f0288da3b1050dad31259f6ea' 
  AND token = 'qbExLN4+0rJEEw+ra4yNUK7E/j3G8WLxR5r11HYmBx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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