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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26c7e22e929d96bb50700714d109d8ba8ddce190837ca21568f98679606de18' 
  AND token = 'J24qOWRXBySrzvz7mIi4bUPJNs6Sav3tzieOR+CVuXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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