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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f1e7b0929094a0662584075de0a0065e5777eb10ccd3e5f93d8de3a855b1bc' 
  AND token = 'THnxIz73g0G3jlDwDHf4Iq14aAbdaxbQ/Kfb3j7N+E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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