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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade4195764be3b4d62ef392219bef565117b7c101432f242d2e14baf5a30f381' 
  AND token = '9iL6lQV4gxp4ZKc1+S3Z3fzr0sz10Ra3grKoiPbI6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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