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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de444253dcac4305ce14728faa6a4bfbdf6a35910f8f4c128e4acae6e673e223' 
  AND token = '1tHVpCeQ3RvSnaW6tVl86FiN3hZOxfUIKtUmVyeAA2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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