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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95b4b9ae9880941baff13cb6c8d724e4ec8ebe47ea7d23f0bc3eaf5bdf91d23' 
  AND token = 'bwgmAB7sqqoufHGN6HAV5om/veaxGdO6jhGVwEdrzsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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