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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d17319eb32d628268ee90816f48f716066b81dc7360e82d782f2999a86bf7a' 
  AND token = '47+WffnNEoGZKIlPVHOqm1rByknV2LRQ2zwT6mviir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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