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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9630287af7789dbd0b5b78bd2ac54690b048ff53e804aef1af032f0bcb9bf8' 
  AND token = 'TecDq/Bk/AjYdZwYm6DgXwEROg6Qi2HbW7MlVw8UYUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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