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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f07b0d81c7ef641b904d4d49e04184aff81b423b693d43d8f230d7685c0970c' 
  AND token = '6Q6VLYMmzsij8ifaHrAY6D9aQWCzln0J3aGs4p7kT1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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