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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d28b10016cc304bd7267013f399313b732c731db56ca08d4420663ab2e54b63' 
  AND token = '0NF0d3/bdsUD8in98q+za06+utvoRFiT8ZYrIhHkImI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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