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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c44f68af6bb978f3f101eae9ed3ba0c4b5e584e02eca01e8e59801a151562f' 
  AND token = 'DC/bPKvutxFaO/cijBtTNheHXG60sloS4vawv3daC8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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