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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c92d4fb6c0a0321371c23f6cef7557cf3499f6ff62c8e46ee38e2757e5bf12' 
  AND token = 'hDBdDIU6tOQc9cMMEc/zwH+7RUe9+zIhz0NCie7zrGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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