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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd8d79ef4ad7d738c264574bd6ebffc61a625daf819a91dad933ec936c688f6' 
  AND token = 'FSo/9dlVXY2GXTE47n3JNbfNn89E6zpqKRX5v1ngkj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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