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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8b758199ca8a7002c109a4750848f98d6e2316e4541be0a7e9bc21e6683261' 
  AND token = 'gPlp7kR8gmsSgxcNN8GyruH/AvVcOV3GxLnM/smg9+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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