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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eada553e2f7bae53b1467d98c57d81cee9857b3207323a053ee1823825f19e' 
  AND token = 'rf+X2ZrwWS80fLKjeag3EC94FPOoxWpp5TxUYdZJy1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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