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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30eb4cf12e94a3c079e2c076c3c1b2d05e211e8974cce37f025986b8862d3c4' 
  AND token = 'hvPAdCIRNAlMrZNVkV97+W68qxIaoEjzpavU0lGAI/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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