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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f05e7ef97b13fe7ecf06eff9a4ecec53fa2724c6f1ba59ed3d450931da10d9' 
  AND token = '7DtVwhhe0FKSVn3z0/by7P3d7PHdxSWi5/PF6lXSRDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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