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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41f07f8ef628f172d0f0914a541991a8befab157bce8f357d634c205b0e0b4a' 
  AND token = 'IllaOnChSL0RXV7tpnr/pILRNtn/xNf5n8fG5Nk5QjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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