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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1118ca688f2390dd99ba105fb0043f7d32bb56c417437283f41bc64e2d88d40' 
  AND token = 'ix9tnEHi2+DVtmBlgTSMUONKD6KDW+xHofJY3H1Ba9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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