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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b45fd011a3666c565a8f0f20ffb8c4689c366aecdba7a81c4be44a37e6450d' 
  AND token = 'rgRXUpIsQMve9GATUH8QGgnbGvpfgeBfF94MYEG8qVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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