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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f5ff7aaa5157b748c5dfc5732bfa38e127e3151cf9822994fb35d60584059c' 
  AND token = 'FomsMZ2j9wYnorp55oU9L/JRo1Rba33YU+NAAHWD3PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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