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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8fb634b31bcd61706ede15a1e6a8e439415b7030f5de7c06a59d3418e2ece8' 
  AND token = 'ZsY66lM0soS0ATKsvjMiyTegYMK+46EZ4Xk8BwBtT1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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