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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07625d5fb74a27585ee734141fce87a6814274e5cf21bb9bbebb56d58e3f297d' 
  AND token = 'jjCuVy9PU9uSOxmgbs9sL2wCrz2C34vaN9k44H/QPdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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