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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707c3e5072e8022785b0e9c237a4eac0b8d5cb6b86482acaf680f603977e2a39' 
  AND token = 'PRq0aWbDKZLIfqnRLE7gzh958a7W/N9mxDTf26O0xXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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