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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82c9a4a8174d1847073ed099cc630bd2ced4c96815b316c5ae255b829e12974' 
  AND token = 'XYlZijHicAqNIRg2kxG7zMxjR8AiQRn7gq9gzFsfrjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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