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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b9fdc2af3915a68f60bb9b2b575247400e81f4ebf73a3ee2156bdbc32d4f35' 
  AND token = 'mA+4Vk2/i/09ILja4pcGvn5+OM5bFYyhRV2BqJi7Mfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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