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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9312cb771d36f4ae084733345a661a4c81f76e811b4bf7fa0b165a0d6a6014' 
  AND token = '4GOT9Qj+xUz2MU70vwEq86JKM8HWtmYVluxaha85ulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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