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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7924c170ec4b5cb956844c423582e4db02691e20a679f0c90124cecd0133190d' 
  AND token = '5KsMMjQhC4ctOXiVuhl0uR9V7drmTSIBreINWivsgOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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