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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbce0f35eb04239cd7c1d820c8ad9b32754c586a696e3bde478b7d453738cbe3' 
  AND token = '5g3PmluccXyArDRmYSfo1TBa0TdDSEwZaH6IuH2uBYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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