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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f67f39f4e18ca4d88cb413cb19dcd26a4aac6ce6f7b82d71dec0ca3659e9429' 
  AND token = 'aPOQLLy0M4rBQqUr03EsDhYGd+o1yR21incusd31wb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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