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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0423ec1a9c4d73397f0664e72360deb267df8af6d5d2e45e30233cb719ca8ced' 
  AND token = '/mHsIjAIELYzHMKNBd+5F3ht+rVn+uo7eHlWOTlBHnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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