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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c55930377a2fee155938d27b8fe76865fdfc47a6e5fef660f73f18fea06700' 
  AND token = '83HHiLOlxwpC/uxKMWl4WcgNTeEMmdMzZYFtIr3uKcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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