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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a276a3e06fa25c92c60342373164f8c11d342bd8288fff54f2d5fd80dedea9f' 
  AND token = '8+bIRAiFEJtux/WkQCbmgou9MishCj4yQHV2Om2SZ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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