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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24d376245f724e366801c091067b022ff17cb9dc80d3d8d8b2e35e3f0a310de' 
  AND token = 'dTnRVEerBtUQud5N4vj8jQA+CdE2gLYfn76CDKjE0l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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