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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11884c69baad34bad654ed102a6fa8d1987d9035356a7d8c29e7661c50021f3' 
  AND token = 'J93mhaAMJ/rlYwo0K/yMGVWuf4iyILWA8eD5tTMN8n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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