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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077d206e27ff41d6e5c6a7343365919cf6f8196a79fc6840e51c694928391f4b' 
  AND token = '2lp8vry95vuewqa4rrVuOK8ie+QQyAFg0sby2b/sUgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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