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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9068fd4c5b40df278a88519df06050693a3dbf0e88ec676782fb1b04ebc26e2' 
  AND token = 'Y3+jsFSMb5UMRECHhUUzGiwQ3YEWCifk8lOnBb/YYOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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