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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9788e55aa7b87e9fcfce80cafbcaa79ae46ecf97dacfff4d17314080e84d42' 
  AND token = '8pjoqu62x88cAm1coB9MLd91ETm2SaxV539fovkjt20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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