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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9547b9d1fadc0ae50a85963a71a4b152283e3862fa29fab40a70030f81d82aa' 
  AND token = '7hrMZJvefZXKgxTts5I5F64luTSbFuOWXjL5RkFxrMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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