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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4633dbc2c14bb8dbdb1c48a1bcd6f3ad3f55f2bd640460a1abb9e64630a9c976' 
  AND token = 'KJo9BqHaJr089j3EjBOXUjIRyqcuiQ089jJrdc64iMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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