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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbd857dbc96d342dbc1c592dee6bcb4c4f0c7bfbf39e64d062247bd6d7f15ef' 
  AND token = 'bF/rlTcGI2k6iUm9YTvwJNF9oK72zdEokMjp98Zxj2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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